[Bug binutils/27447] New: readelf does not support DWARF 5 forms

[tromey at sourceware dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=27447

            Bug ID: 27447
           Summary: readelf does not support DWARF 5 forms
           Product: binutils
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: binutils
          Assignee: unassigned at sourceware dot org
          Reporter: tromey at sourceware dot org
  Target Milestone: ---

I compiled a simple C program with "clang -g -gdwarf-5 -gpubnames".
When I try to use "readelf" on it, I get some errors:

readelf: Warning: Unrecognized form: 37
readelf: Warning: Unrecognized form: 37
readelf: Warning: Unrecognized form: 37
readelf: Warning: Unsupported form (DW_FORM_strx1) for attribute DW_AT_comp_dir
readelf: Warning: Unrecognized form: 27
readelf: Warning: DIE at offset 0x1f refers to abbreviation number 8 which does
not exist


Sure enough, readelf doesn't seem to support some DWARF 5 forms:

DW_FORM (DW_FORM_addrx, 0x1b)
...
DW_FORM (DW_FORM_strx1, 0x25)

I didn't do an exhaustive check but it's easy to see that some are missing from
dwarf.c, at least read_and_display_attr_value and skip_attr_bytes ... maybe
other
spots as well.

Strangely, to me, I get this error even with "readelf -WS".  I didn't
understand why
this is reading DWARF forms at all.

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